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A zone plate is a device used to focus light or other things exhibiting wave character. [ 1] Unlike lenses or curved mirrors, zone plates use diffraction instead of refraction or reflection. Based on analysis by French physicist Augustin-Jean Fresnel, they are sometimes called Fresnel zone plates in his honor.
The U.S. state of Virginia first required its residents to register their motor vehicles and display license plates in 1906. As of 2022, plates are issued by the Virginia Department of Motor Vehicles (DMV). Front and rear plates are required for most classes of vehicles, while only rear plates are required for motorcycles and trailers.
A waveplate mounted in a rotary mount. A waveplate works by shifting the phase between two perpendicular polarization components of the light wave. A typical waveplate is simply a birefringent crystal with a carefully chosen orientation and thickness. The crystal is cut into a plate, with the orientation of the cut chosen so that the optic axis ...
A laboratory fractionating column is a piece of glassware used to separate vaporized mixtures of liquid compounds with close volatility. Most commonly used is either a Vigreux column or a straight column packed with glass beads or metal pieces such as Raschig rings. Fractionating columns help to separate the mixture by allowing the mixed vapors ...
A Salter–Harris fracture is a fracture that involves the epiphyseal plate (growth plate) of a bone, specifically the zone of provisional calcification. [ 2] It is thus a form of child bone fracture. It is a common injury found in children, occurring in 15% of childhood long bone fractures. [ 3] This type of fracture and its classification ...
Gusset plates are usually square or rectangular, but can be triangular or made into a customized shape to fit the joint. The shape of each plate is designed so that welding or bolts can be applied to different edges of the plate. [2] A gusset plate can form the entire connection or it can be used in conjunction with bolts or welds. [2]
Common [ 2] A rib fracture is a break in a rib bone. [ 1] This typically results in chest pain that is worse with inspiration. [ 1] Bruising may occur at the site of the break. [ 3] When several ribs are broken in several places a flail chest results. [ 4] Potential complications include a pneumothorax, pulmonary contusion, and pneumonia. [ 2][ 1]
2,4-Dinitrophenylhydrazine ( 2,4-DNPH or DNPH) is the organic compound C 6 H 3 (NO 2) 2 NHNH 2. DNPH is a red to orange solid. It is a substituted hydrazine. The solid is relatively sensitive to shock and friction. For this reason DNPH is usually handled as a wet powder. DNPH is a precursor to the drug Sivifene .
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